Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8603b7d19bcce3c989cca094549f5c3b65705fd715cade9e8fe8dbb07b714c5' 
  AND token = 'WfSwm9aioOt/SC8BbVt4p30zT/11Q/x3m25tO5TIf4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}